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        <div class="span12">
          <h4 id="title">Filtering features with WebGL</h4>
          <p class="tags">
            <span class="badge-group">
              <a
                href="./index.html?q=webgl" class="badge badge-info">webgl</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="webgl"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-layer-swipe.html&quot;&gt;Layer Swipe (WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./numpytile.html&quot;&gt;Rendering 16-bit NumpyTiles&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-sea-level.html&quot;&gt;Sea Level (with WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-shaded-relief.html&quot;&gt;Shaded Relief (with WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tiles.html&quot;&gt;WebGL Tiles&lt;/a&gt;"
                tabindex="0"
                >12</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=icon" class="badge badge-info">icon</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="icon"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-icon.html&quot;&gt;Icon modification&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;"
                tabindex="0"
                >8</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=sprite" class="badge badge-info">sprite</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="sprite"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;"
                tabindex="0"
                >2</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=filter" class="badge badge-info">filter</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="filter"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./image-filter.html&quot;&gt;Image Filters&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-getfeature.html&quot;&gt;WFS - GetFeature&lt;/a&gt;"
                tabindex="0"
                >3</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=feature" class="badge badge-info">feature</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="feature"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-hit-detection-renderer.html&quot;&gt;Custom Hit Detection Render&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-move-animation.html&quot;&gt;Marker Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
                tabindex="0"
                >12</a>
            </span>
          </p>
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                  <div class="list-group"></div>
                </div>
              </div>
            </div>
          </div>
          <div id="map" class="map"></div>
<form>
  <div id="status">Show impacts between <span class="min-year"></span> and <span class="max-year"></span></div>

  <label for="min-year">Minimum year:</label>
  <input id="min-year" type="range" min="1850" max="2015" step="1" value="1850"/>
  <label for="max-year">Maximum year:</label>
  <input id="max-year" type="range" min="1850" max="2015" step="1" value="2015"/>
</form>

        </div>
        <form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
          <input id="codesandbox-params" type="hidden" name="parameters">
        </form>
      </div>

      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Using WebGL to filter large quantities of features</p>
          <div id="docs"><p>This example shows how to use <code>ol/layer/WebGLPoints</code> with a literal style to dynamically filter a large amount
  of point geometries. The above map is based on a dataset from the NASA containing 45k recorded meteorite
  landing sites. Each meteorite is marked by a circle on the map (the bigger the circle, the heavier
  the object). A pulse effect has been added, which is slightly offset by the year of the impact.</p>
<p>Adjusting the sliders causes the objects outside of the date range to be filtered out of the map. This is done
  by mutating the variables in the <code>style</code> object provided to the WebGL layer. Also note that the last snippet
  of code is necessary to make sure the map refreshes itself every frame.</p>
</div>
        </div>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">main.js</h5>
        <pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Feature from &#x27;ol/Feature&#x27;;
import Map from &#x27;ol/Map&#x27;;
import Point from &#x27;ol/geom/Point&#x27;;
import Stamen from &#x27;ol/source/Stamen&#x27;;
import TileLayer from &#x27;ol/layer/Tile&#x27;;
import View from &#x27;ol/View&#x27;;
import WebGLPointsLayer from &#x27;ol/layer/WebGLPoints&#x27;;
import {Vector} from &#x27;ol/source&#x27;;
import {fromLonLat} from &#x27;ol/proj&#x27;;

const vectorSource &#x3D; new Vector({
  attributions: &#x27;NASA&#x27;,
});

const oldColor &#x3D; &#x27;rgba(242,56,22,0.61)&#x27;;
const newColor &#x3D; &#x27;#ffe52c&#x27;;
const period &#x3D; 12; // animation period in seconds
const animRatio &#x3D; [
  &#x27;^&#x27;,
  [
    &#x27;/&#x27;,
    [
      &#x27;%&#x27;,
      [
        &#x27;+&#x27;,
        [&#x27;time&#x27;],
        [&#x27;interpolate&#x27;, [&#x27;linear&#x27;], [&#x27;get&#x27;, &#x27;year&#x27;], 1850, 0, 2015, period],
      ],
      period,
    ],
    period,
  ],
  0.5,
];

const style &#x3D; {
  variables: {
    minYear: 1850,
    maxYear: 2015,
  },
  filter: [&#x27;between&#x27;, [&#x27;get&#x27;, &#x27;year&#x27;], [&#x27;var&#x27;, &#x27;minYear&#x27;], [&#x27;var&#x27;, &#x27;maxYear&#x27;]],
  symbol: {
    symbolType: &#x27;circle&#x27;,
    size: [
      &#x27;*&#x27;,
      [&#x27;interpolate&#x27;, [&#x27;linear&#x27;], [&#x27;get&#x27;, &#x27;mass&#x27;], 0, 8, 200000, 26],
      [&#x27;-&#x27;, 1.75, [&#x27;*&#x27;, animRatio, 0.75]],
    ],
    color: [&#x27;interpolate&#x27;, [&#x27;linear&#x27;], animRatio, 0, newColor, 1, oldColor],
    opacity: [&#x27;-&#x27;, 1.0, [&#x27;*&#x27;, animRatio, 0.75]],
  },
};

// handle input values &amp; events
const minYearInput &#x3D; document.getElementById(&#x27;min-year&#x27;);
const maxYearInput &#x3D; document.getElementById(&#x27;max-year&#x27;);

function updateMinYear() {
  style.variables.minYear &#x3D; parseInt(minYearInput.value);
  updateStatusText();
}
function updateMaxYear() {
  style.variables.maxYear &#x3D; parseInt(maxYearInput.value);
  updateStatusText();
}
function updateStatusText() {
  const div &#x3D; document.getElementById(&#x27;status&#x27;);
  div.querySelector(&#x27;span.min-year&#x27;).textContent &#x3D; minYearInput.value;
  div.querySelector(&#x27;span.max-year&#x27;).textContent &#x3D; maxYearInput.value;
}

minYearInput.addEventListener(&#x27;input&#x27;, updateMinYear);
minYearInput.addEventListener(&#x27;change&#x27;, updateMinYear);
maxYearInput.addEventListener(&#x27;input&#x27;, updateMaxYear);
maxYearInput.addEventListener(&#x27;change&#x27;, updateMaxYear);
updateStatusText();

// load data
const client &#x3D; new XMLHttpRequest();
client.open(&#x27;GET&#x27;, &#x27;data/csv/meteorite_landings.csv&#x27;);
client.onload &#x3D; function () {
  const csv &#x3D; client.responseText;
  const features &#x3D; [];

  let prevIndex &#x3D; csv.indexOf(&#x27;\n&#x27;) + 1; // scan past the header line

  let curIndex;
  while ((curIndex &#x3D; csv.indexOf(&#x27;\n&#x27;, prevIndex)) !&#x3D; -1) {
    const line &#x3D; csv.substr(prevIndex, curIndex - prevIndex).split(&#x27;,&#x27;);
    prevIndex &#x3D; curIndex + 1;

    const coords &#x3D; fromLonLat([parseFloat(line[4]), parseFloat(line[3])]);
    if (isNaN(coords[0]) || isNaN(coords[1])) {
      // guard against bad data
      continue;
    }

    features.push(
      new Feature({
        mass: parseFloat(line[1]) || 0,
        year: parseInt(line[2]) || 0,
        geometry: new Point(coords),
      })
    );
  }

  vectorSource.addFeatures(features);
};
client.send();

const map &#x3D; new Map({
  layers: [
    new TileLayer({
      source: new Stamen({
        layer: &#x27;toner&#x27;,
      }),
    }),
    new WebGLPointsLayer({
      style: style,
      source: vectorSource,
      disableHitDetection: true,
    }),
  ],
  target: document.getElementById(&#x27;map&#x27;),
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});

// animate the map
function animate() {
  map.render();
  window.requestAnimationFrame(animate);
}
animate();
</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">index.html</h5>
        <pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  &lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;Filtering features with WebGL&lt;/title&gt;
    &lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
    &lt;script src="https://unpkg.com/elm-pep@1.0.6/dist/elm-pep.js"&gt;&lt;/script&gt;
    &lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
    &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
    &lt;style&gt;
      .map {
        width: 100%;
        height:400px;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;form&gt;
      &lt;div id&#x3D;&quot;status&quot;&gt;Show impacts between &lt;span class&#x3D;&quot;min-year&quot;&gt;&lt;/span&gt; and &lt;span class&#x3D;&quot;max-year&quot;&gt;&lt;/span&gt;&lt;/div&gt;

      &lt;label for&#x3D;&quot;min-year&quot;&gt;Minimum year:&lt;/label&gt;
      &lt;input id&#x3D;&quot;min-year&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;1850&quot; max&#x3D;&quot;2015&quot; step&#x3D;&quot;1&quot; value&#x3D;&quot;1850&quot;/&gt;
      &lt;label for&#x3D;&quot;max-year&quot;&gt;Maximum year:&lt;/label&gt;
      &lt;input id&#x3D;&quot;max-year&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;1850&quot; max&#x3D;&quot;2015&quot; step&#x3D;&quot;1&quot; value&#x3D;&quot;2015&quot;/&gt;
    &lt;/form&gt;
    &lt;script src="main.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">package.json</h5>
        <pre><code id="example-pkg-source" class="language-json">{
  &quot;name&quot;: &quot;filter-points-webgl&quot;,
  &quot;dependencies&quot;: {
    &quot;ol&quot;: &quot;6.13.0&quot;
  },
  &quot;devDependencies&quot;: {
    &quot;parcel&quot;: &quot;^2.0.0&quot;
  },
  &quot;scripts&quot;: {
    &quot;start&quot;: &quot;parcel index.html&quot;,
    &quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
  }
}</code></pre>
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